Gallons per Foot of Pipe Calculator

Volume per Foot Formula:

\[ V_{gal/ft} = \frac{\pi \times r^2 \times 12}{231} \]

Volume per Foot:

gallons/ft

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1. What is Gallons per Foot of Pipe?

Definition: This calculator determines the volume of liquid a pipe can hold per linear foot, measured in gallons.

Purpose: It helps plumbers, engineers, and irrigation specialists calculate fluid capacity in pipes for system design and maintenance.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V_{gal/ft} = \frac{\pi \times r^2 \times 12}{231} \]

Where:

\( V_{gal/ft} \) — Volume per foot (gallons)
\( r \) — Inner radius of pipe (inches)
\( \pi \) — Mathematical constant (~3.14159)
12 — Inches per foot conversion
231 — Cubic inches per gallon conversion

Explanation: The formula calculates the cylindrical volume of one foot of pipe and converts it from cubic inches to gallons.

3. Importance of Volume per Foot Calculation

Details: Knowing this value helps in determining system capacity, flow rates, chemical dosing, and pipe sizing for various applications.

4. Using the Calculator

Tips: Simply enter the inner radius of the pipe in inches. The radius is half of the inner diameter.

5. Frequently Asked Questions (FAQ)

Q1: Why use radius instead of diameter?
A: The formula uses radius because the area calculation is πr². You can divide diameter by 2 to get radius.

Q2: Does this account for pipe thickness?
A: No, you must use the inner radius (inside diameter ÷ 2) for accurate fluid volume calculations.

Q3: What's the 231 conversion factor?
A: There are 231 cubic inches in one US liquid gallon (standard conversion).

Q4: Can I use this for metric units?
A: This calculator uses US customary units. For metric, you'd need different conversion factors.

Q5: How accurate is this calculation?
A: It's mathematically precise for perfect cylinders. Real pipes may vary slightly due to manufacturing tolerances.